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4.3.2.1 Generation of stiffness matrix.
The non-overlapping node distributions is the quite natural
distribution when finite volumes (FVM) are used in the discretization.
If a FEM or FDM discretization is used, then the local stiffness
matrix 
has to include all connections to the next layer of
nodes contained in neighboring elements.
Gundolf Haase
2000-03-20